Burglar alarm



6.. AN'TOFILLIL BURGLAR ALARM- A PPLI CATION FILED AUG-28,1919. 1,4205 10, Y Patented June 20, 1922.

2 'SHEETS-SHEET i.

InI/Enar G. ANTOFILLI.

BURGLAR ALARM. APPLICATION FILED AUG-28, 1919.

Patented June 20, 1922.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

GIOVANNI An'roriLLI, or new YORK, N. Y.

BURGLAR ALARM.

Specification of Letters Patent. Patented June 20, 1922,

Application filed August 28. 1919; Serial No. 320,401.

lowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improved burglar alarm and one object of the invention is to provide a burglar alarm so constructed that an electro-magnet may be energized when it is attemptedto open a door, the magnet when energized releasing a spring controlled switch element to close the circuit of an electric bell thus permitting the bell to ring.

Another object of the invention is to so construct this burglar alarm that the elecric .bell will continue to ring until the spring controlled switch is manually re turned to an inoperative position.

Another object of the invention is to so construct this burglar alarm that the mag net energizing circuit may be in circuit with the battery for the bell ringing circuit.

v Another object of the invention is to provide an improved type of contact element for the electro-magnet energizing circuit and an improved actuating device for closing this contact, the contact being mounted upon the door jamb and the actuating element upon the door. 1 v

' Another object of the invention is to so construct this contact and actuating element that the actuating element may be. rendered inoperative in case it desired to open the door from the inside thus permitting the door to be opened from within the house without the alarm being sounded.

This invention is illustrated in the accompanying drawings wherein:

Figure 1 is a diagrammatic view, of the burglar alarm system. I

Figure 2 is a sectional view taken along the line 22 of Figure 1;

Figure is a sectional view taken along the line 83 of Figure 1 looking towards the magnet.

Figure 4- is a perspective view of the contact and actuating device mounted upon the door jamb and door respectively.

Figure 5 is a perspective view of: the

terminal of its coil connected with the 13 and the second terminal or its coil conspring winding disk looking at the inner face thereof.

Figure (5 is a sectional View taken along the line 6-6 of'Figure 1.

This burglar alarm is provided with a signal or electric bell 10 which is mounted upon a supporting board 11 and may be located at the most desirable point in a residence. The board 11, in addition to the bell, carries contact posts 12, 13, 1 1 and 15 and the bell 1s provided with the usual posts 16 and 17. An electro-magnet 18 is carried by supporting brackets 19 and 20 and has one post nected with the post 15 from which extends awire connected with the bell post 17. The terminal post 12 is connected with the terminal post 15 and is in circuit with the battery or other source of current 21 throu h the medium of the wire 22, the second wire 23 being connected with the terminal post 14. ,Wires 24 and 25 lead from the terminal posts 13 and 14: and are connected with the contacts 26 and 27 to be hereinafter more fully described, a switch 28 being provided so that the circuit through the magnet may be rendered inoperative when desired.

From the above description it will be readily seen that when the contacts 26 and 27 are in engagement and the switch 28 .closed, a circuit will be established through the electro-magnet thus energizing the mag net and causing the armature pin 29 thereof to be drawn inwardly.

The armature pin 29. of this magnet 18 carries a head 30 which limits inward movement of the pin and which is engaged. by the spring 31 serving to normally retain the pin in an extended position. The core 32 of this magnet extends beyond the lower end thereof as a tube 32 and journals a sleeve 33 having at one end a disk 34: and at the opposite end a spring housing 35 in which is positioned a spring 36. The armature pin 29 is slidably mounted in a longitudinally extending opening formed in the core32 and is provided with a finger 37 which extends through a side slot 87 in the tube 32 and is adapted to fit into a notch 38 formed in the lower end portion of the sleeve 33 and holding the sleeve against rotarv movement when seated in the notch.

WVlien the magnet is energized, and the armature pin is drawn inwardly against the tension. of the spring 31, the finger will move out of the notch thus releasing and permitting this sleeve to rotate under urgency of the spring 36. A spring winding disk 39 closes the spring housing and carries p'v is 4:0 which engage the free end of the spring 86. The disk will be put in place and after being turned to tighten the spring will be secured by a screw 40'. hen the armature pin moves to the inoperative position, the spring will rotate the sleeve and the contact arm 4-1 carried thereby will engage the contact 42 carried by the bracket 20. This bracket 20 further carries a terminal screw 43 which is connected with the terminal screw 16. A. terminal screw 4A is carried by the base board 11 and is connected with the terminal screw 14- by wire and with the disk 39 by the short wire d6. It will thus be seen that when the magnet is energized and the sleeve released and turned by spring 36 to bring the contacts 41 and 4-2 into engagement a circuit will be established through the bell thus causing the bell to ring until the sleeve is returned to the normal position through the medium of the handle 4.7. When returned to the normal position, the spring 31 moves the pin 29 to bring the finger thereof into the notch of the sleeve to hold the sleeve in the set position.

The contact arms 26 and 2'? are connected with the insulating base 48 which. will pretterably be "formed of fibre. The contact arms will be formed of metal having sufiicient resiliency to permit the arm 27 to be swung into engagement with the arm 26, the end portion 26 of which extents across the thickened end portion of the arm 27. This thickened end portion of the arm 27 has a beveled end which extends beyond the base 48 and is adapted to pass through the cutout 4.9 of the plate 50 secured. to the door 51. This plate 50 carries a plui'iger M which. has a pin 52 slidably mounted in the opening of the lug 53, a spring 5-11; being providedv to normally retain the rdui'iger in an extended position and a strap or bracket 55 liieing provided to guide the sliding movement of the plunger. The end o't' this plunger is beveled. or under-cut as shown so that when the door is closed the plunger may ride past the contact 27. In order to permit the door to be closed and opened without the alarm being given, the plunger may be retained in a retracted position by any suitable means or the contact 26 or 27 may be swung to an inoperative position.

h en in use, the bu rglar alarm stalled shown in the diagram in Figure 1. The signal will be placed at a suitable point in a house and the battery wires 22 and 23 connected with the terminal post: 12 and 1 1-. The contact carrying base plate [8 and the plate 50 which carries the plunger will be mounted upon a door jamb and door will be inrespectively. at which it is desired toprotect against unauthorized opennw and the coutai. s 26 and connected with the terminal posts and 1-1; by the hue wires 2':

and it an unauthorized person attempts to enter through the door the plunger will engage the contact arm 2'? and move the same into engagement with the contact arm 26 thus closing the circuit through the electroanagnet and causing the m a gnet to be energized. This will draw the armature pin inwardly and move the linger 3? out of the notch in the sleeve thereby releasing the sleeve and permitting the spring 36 to swing the sleeve to bring the contacts L1 and :229 into engagement. This closes the circuit hrough the bell. and the bell. will ring until the sleeve is returned to the original position. The spring 3i will then move the pin 20 to bring the linger thereoil again into the notch of the sleeve thus retaining the sleeve in the desired position. it will thus be seen that there has been. :rovided an alarm in which the movement of? a deer toward an open position will cause the bell to ring and that this bell will continue to ring until manually shut oil. 'llheretore, there is no danger ot the bel being rung for a very snort length or time and 'lailing to wake the occupant of the house in which. the alarm is installed. Tt will be iiurther noted that this is a very simple system which. can be easily installed and which does not require the services oi? an experienced electrician in. order to be properly installed.

ll hat is claimed is:

1. switch mechanism of the class described includin a fixed member. a rotar T member jc-urnaled thereon having a contact memb r, a contact member in circuit withv said contact member and engageable thereby, a. spring within. the rotary member to urge rotation thcreol deteut means for the rotary mei'uber slidably mounted in. a fixed member and having a detent member n'ojecting theretlu-ough to normally restrain niovemcnt oi the rolarv uu-mher.

2. A switch u'iechauisni ot the character described. ha viug a lined membzn. provided with a tube having a. slot therethrough, a rotary meml er jourualml on the tube luiving a laterally extending wall provided with a contact and. having a housing a contact in circuit with said cimtact and engagczble thereby, a rod slidable in the fixed member having a lug e:-;tending through said slot, said housing having a notch lo receive said lug and a spring eugagii'ig the rod. and fixed inen'iber to maintain the rod. in the notch, and means in the housing to urge movement of the rotary member. I

3. A switch incchanirnn of the character described having a lined. member nrovided with a tube having a slot therethrough, a rotary member journalcd on the tube having engaging the last spring, the closure being turnable on the tube to Wind the last spring and means to rigidly secure the closure to the tube.

In testimony whereof I afiix my signature in presence of two Witnesses.

GIOVANNI ANTOFILLI.

WVitnesses GUIDO ZARA, A. O. ORSA. 

